So I created a stage at last. I have put my skills to work, and made for myself my first stage... Since its my first stage, I only thought of the sky bonus levels in the original Super Mario Bros, but I think I have made a good job using the "levelno" and "delta" parameters. I'm going to make a page for it later and add it to my user profile, but for now, check it out by downloading it from my DropBox, listed down here:
I hope you enjoy it. Any suggestions are greatly appreciated.